Level 1 DFD also mentions basic processes and sources of information. Level 1 DFD depicts basic modules in the system and flow of data among various modules. Level 1 - The Level 0 DFD is broken down into more specific, Level 1 DFD.Level 0 DFDs are also known as context level DFDs. Level 0 - Highest abstraction level DFD is known as Level 0 DFD, which depicts the entire information system as one diagram concealing all the underlying details.Data movement is shown from the base of arrow as its source towards head of the arrow as destination. Data Flow - Movement of data is shown by pointed arrows.Data Storage - There are two variants of data storage - it can either be represented as a rectangle with absence of both smaller sides or as an open-sided rectangle with only one side missing.Process - Activities and action taken on the data are represented by Circle or Round-edged rectangles.Entities are represented by a rectangles with their respective names. Entities - Entities are source and destination of information data. ![]() It is more specific and close to the implementation.ĭFD can represent Source, destination, storage and flow of data using the following set of components.
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